アップルiMac 2009 21,5インチOS High Sierra,macOS 10.13, High Sierra 2009 Released Apple Desktops & All,macOS 10.13, High Sierra 2009 Released Apple Desktops & All,macOS 10.13, High Sierra 2009 Released Apple Desktops & All,Reinstalling an 2009 iMac in 2023 | by nol ɹǝʇɐʍ | Medium